LMHP Linear Bearing UU Series — Square Flanged Sealed Ball Bushing
LMHP…UU flanged recirculating linear ball bearing series — ISO Square Flange. 9 bore sizes. Dynamic load 206–1570 N. GCr15 HRC 58–64, dual lip seals, flanged housing mount.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
Linear Bearings › Flanged Series › ISO Square Flange
LMHP Linear Bearing UU Series — Square Flanged Sealed Ball Bushing
9 bore sizes • Dynamic load 206–1570 N • ISO Square Flange
GCr15 HRC 58–64
Flanged Mount
Dual Lip Seal
🆕 Series Overview
The LMHP...UU series is a square-flange linear ball bearing with four equally spaced bolt points at 90° intervals. Unlike round or diamond flanges, the square flange resists bearing rotation under torsional loads — the flat faces of the flange square against the housing walls to provide positive rotational location. This makes LMHP the preferred choice when a torque load component acts on the guided axis.
The LMHP flange face is ground flat and perpendicular to the bore axis, providing a clean sealing surface against the housing face that reduces contamination ingress pathways. The four bolt holes distribute clamping load evenly, and the flat outer faces of the flange can serve as datum references during assembly.

⚙ Key Design Features
Flanged Axial Location
The precision-ground flange face registers directly against the housing shoulder, providing positive axial location without snap rings or adhesive retention.
GCr15 Chrome Steel
Through-hardened to HRC 58–64. Ball tracks ground to Ra 0.2 µm for full-film lubrication at the ball-race contact under rated load conditions.
Dynamic Load 206–1570 N
Covering 9 bore sizes for applications from lightweight instrument stages to heavy industrial press guides.
NBR Dual Lip Seals
Retain factory-applied NLGI-2 grease while excluding dust and contamination. Rated −20°C to +80°C continuous service.
PA66-GF30 Retainer
Glass-filled nylon cage maintains precise ball spacing across the full 360° circuit, preventing ball-to-ball contact and associated noise.
ISO/DIN Interchangeable
All dimensions conform to ISO Square Flange standards for direct replacement compatibility with equivalent housings.
📋 Complete Specification Table
ⓘ Dynamic load rating C based on 50 km nominal life (L10). For 100 km design life, divide C by 1.26. Shaft h6/h7. Housing H7. All dimensions in mm, load ratings in N, weight in g.
| Model | Bore dr | OD D | Length L | H mm | W mm | A mm | F mm | Ball Cir. | Dyn C (N) | Sta Co (N) | Wt (g) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LMHP6UU | 6 | 12 | 19 | 19 | 18 | 5 | 20 | 4 | 206 | 265 | 21 |
| LMHP8UU | 8 | 15 | 24 | 21 | 21 | 5 | 24 | 4 | 274 | 392 | 33 |
| LMHP10UU | 10 | 19 | 29 | 25 | 25 | 6 | 29 | 4 | 372 | 549 | 64 |
| LMHP12UU | 12 | 21 | 30 | 27 | 27 | 6 | 32 | 4 | 510 | 784 | 68 |
| LMHP13UU | 13 | 23 | 32 | 29 | 29 | 6 | 33 | 4 | 510 | 784 | 81 |
| LMHP16UU | 16 | 28 | 37 | 34 | 34 | 6 | 38 | 5 | 774 | 1180 | 112 |
| LMHP20UU | 20 | 32 | 42 | 38 | 38 | 8 | 42 | 5 | 882 | 1370 | 167 |
| LMHP25UU | 25 | 40 | 59 | 46 | 46 | 8 | 51 | 6 | 980 | 1570 | 325 |
| LMHP30UU | 30 | 45 | 64 | 51 | 51 | 10 | 60 | 6 | 1570 | 2740 | 388 |

🔭 Materials & Construction
GCr15 chrome-bearing steel (AISI 52100), HRC 58–64. The square flange is precision-machined and ground on all faces, with flange face squareness to bore axis within 0.02 mm across the series. PA66-GF30 nylon retainer. NBR dual lip seals −20°C to +80°C. Factory NLGI-2 grease fill.
The ball retainer is injection-moulded from glass-fibre-reinforced nylon (PA66-GF30), maintaining precise ball spacing around the full 360° circuit to prevent ball-to-ball contact noise at higher traverse speeds. Dual NBR lip seals on both end faces retain factory-applied NLGI-2 lithium-complex grease while excluding dust, swarf, and splash contamination. Operating temperature range is −20°C to +80°C with standard seals and grease.
🏭 Typical Applications
Medical Device Manufacturing
Square-flange (LMH/LMHP) bearings are preferred in syringe pump drives and diagnostic cartridge dispensers because the flat flange face seals cleanly against the housing wall, reducing contamination pathways in sterile manufacturing environments.
Food & Beverage Processing
Flanged bearings in filling-nozzle platforms and portioning conveyors allow rapid cartridge replacement during product changeovers; the flange retains the bearing against the housing face without tools, reducing changeover time.

🔧 Installation & Maintenance
🔎 Flange Face Seating
Ensure the housing counterbore depth matches the bearing flange thickness. An under-depth counterbore leaves the flange proud of the housing face, creating a gap at the bolt interface that allows the bearing to rock under load and introduces harmonic error motion.
🔧 Bolt Torque Sequence
Tighten flange mounting bolts in a cross pattern to 30–50% of final torque, then complete to specification. Sequential tightening distorts the flange and shifts the bore axis by up to 0.05 mm, degrading shaft alignment.
📈 Housing Bore Tolerance
Machine the housing bore to H7 tolerance. For square-flange (LMH/LMHP) variants, also verify the flange seating face is square to the bore within 0.02 mm to prevent cocking the bearing on assembly.
⚙ Lubrication
Apply NLGI-2 lithium-complex grease to the shaft before insertion. Re-lubricate every 500 km of travel or 6 months under normal duty. In washdown environments, shorten the re-lubrication interval and use a water-resistant grease formulation.
🔎 Selection Guide
Select LMHP when torsional loads would cause a round or diamond flange to rotate in the housing. Verify the square flange envelope (dimension W) clears all adjacent housing features. The four bolt holes must align with the housing bolt pattern — LMHP is not rotationally adjustable after installation.
①
Confirm Bore & Standard
Match bore diameter to shaft. Confirm ISO Square Flange housing dimensions — mixing ISO and DIN outer diameters requires housing re-machining.
②
Select Flange Style
Round flange for maximum moment resistance; diamond flange for compact bolt clearance; square flange for torsional resistance.
③
Calculate Load & Life
Compute radial load P. Target L10 = (C/P)³ × 50 km. If life is marginal, specify the LUU extended variant to raise C without changing bore.
④
Contact Us
MOQ 100 units per model. Contact our team with engineering drawings confirming shaft diameter, housing bore depth, bolt PCD, load case, and target life.

❓ Frequently Asked Questions
📞 Ready to Order?
MOQ is 100 units per model. Provide engineering drawings with shaft diameter, housing bore depth, flange PCD, load case, stroke, speed, and target life. All catalogue data is for reference only — verify critical dimensions against current revision drawings before committing to tooling.
LMHP…UU flanged recirculating linear ball bearing series — ISO Square Flange. 9 bore sizes. Dynamic load 206–1570 N. GCr15 HRC 58–64, dual lip seals, flanged housing mount.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.





